Added contributing suggestions.
Added contributing suggestions.
01walid/thephpleague.github.io,colinodell/thephpleague.github.io,colinodell/thephpleague.github.io,colinodell/thephpleague.github.io,thephpleague/thephpleague.github.io,thephpleague/thephpleague.github.io,01walid/thephpleague.github.io,thephpleague/thephpleague.github.io